Laboratory Work in Applied Chemistry, for Students in Domestic Science
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Determination of Ash, Principle of the Method. — The milk is treated with nitric acid to assist in the oxidation of the organic matter, then evapo- 35 rated to dryness and finally ignited to burn ofif the carbonaceous material. The residue is the mineral matter or ash.
Apparatus. — Thin porcelain dish, Bunsen burner, tripod, triangle, desiccator, balance and weights.
Details of Procedure. — Carefully weigh the porcelain dish to the nearest milligram. Transfer to it from a weighing bottle a quan...tity of milk weighed accurately to centigrams (approxi- mately 20 grams). Add 6 c.c. of nitric acid and evaporate on the steam bath. When dry, place on the tripod and heat cau- tiously to dull redness until the residue is perfectly white. Cool in a desiccator and weigh to the nearest milligram.
Calculation of Result. — Per cent, ash = 100 (weight of ash) /(weight of milk).
5a. Determination of Fat (Babcock Method).
Principle of the Method. — When concentrated sulphuric acid is added to milk the emulsion is destroyed, the milk is curdled, the casein subsequently dissolved.
What to read after Laboratory Work in Applied Chemistry, for Students in Domestic Science?
You can find similar books in the "Read Also" column, or choose other free books by Henwood, Abraham. [from Old Catalog] to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Determination of Ash, Principle of the Method. — The milk is treated with nitric acid to assist in the oxidation of the organic matter, then evapo- 35 rated to dryness and finally ignited to burn ofif the carbonaceous material. The residue is the mineral matter or ash.
Apparatus. — Thin porcelain dish, Bunsen burner, tripod, triangle, desiccator, balance and weights.
Details of Procedure. — Carefully weigh the porcelain dish to the nearest milligram. Transfer to it from a weighing bottle a quan...tity of milk weighed accurately to centigrams (approxi- mately 20 grams). Add 6 c.c. of nitric acid and evaporate on the steam bath. When dry, place on the tripod and heat cau- tiously to dull redness until the residue is perfectly white. Cool in a desiccator and weigh to the nearest milligram.
Calculation of Result. — Per cent, ash = 100 (weight of ash) /(weight of milk).
5a. Determination of Fat (Babcock Method).
Principle of the Method. — When concentrated sulphuric acid is added to milk the emulsion is destroyed, the milk is curdled, the casein subsequently dissolved.
What to read after Laboratory Work in Applied Chemistry, for Students in Domestic Science?
You can find similar books in the "Read Also" column, or choose other free books by Henwood, Abraham. [from Old Catalog] to read onlineMoreLess
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